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Disable ViewportMetrics unless MouseEvent lacks support for pageX/pageY #6129

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Merged
merged 1 commit into from
Feb 26, 2016
Merged

Disable ViewportMetrics unless MouseEvent lacks support for pageX/pageY #6129

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12 changes: 10 additions & 2 deletions src/renderers/dom/client/ReactBrowserEventEmitter.js
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,7 @@ var isEventSupported = require('isEventSupported');
* React Core . General Purpose Event Plugin System
*/

var hasEventPageXY;
var alreadyListeningTo = {};
var isMonitoringScrollValue = false;
var reactTopListenersCounter = 0;
Expand Down Expand Up @@ -345,12 +346,19 @@ var ReactBrowserEventEmitter = assign({}, ReactEventEmitterMixin, {
* Listens to window scroll and resize events. We cache scroll values so that
* application code can access them without triggering reflows.
*
* ViewportMetrics is only used by SyntheticMouse/TouchEvent and only when
* pageX/pageY isn't supported (legacy browsers).
*
* NOTE: Scroll events do not bubble.
*
* @see http://www.quirksmode.org/dom/events/scroll.html
*/
ensureScrollValueMonitoring: function() {
if (!isMonitoringScrollValue) {
ensureScrollValueMonitoring: function(){
if (hasEventPageXY === undefined) {
hasEventPageXY =
document.createEvent && 'pageX' in document.createEvent('MouseEvent');
}
if (!hasEventPageXY && !isMonitoringScrollValue) {
var refresh = ViewportMetrics.refreshScrollValues;
ReactBrowserEventEmitter.ReactEventListener.monitorScrollValue(refresh);
isMonitoringScrollValue = true;
Expand Down